Do you have more than one connection server? If so, shut down all of your connection servers and then start them back up. That has happened to me twice, usually during upgrades. It's caused by the connection servers getting out of sync and the only way to force them to get back on the same page is to reboot them to force them to. VMware support called it something along the lines of a "VCCache hang" or something like that with is the connection server databases being out of sync.
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